Blackhawk makes the Serpa, but offer very few models for the HK. Why? Don't ask me. I like Safariland in their SLS rig, and just found Blade-Tech is making a line of duty and tactical holsters for HKs with light adapters and tac lights. Mine is a USP 45F, GG&G rail with a TLR-2. They made a holster for me in about 2 weeks shipped, the same can be had for a thigh rig if I wanted it. You can check with them about sights, I know they can pose a problem with fit, my Blade-Tech has substantial clearnance over the sights left over on my 45F, they have probably considered and addressed the adjustable sight issue over at Blade-Tech.